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 2023-10-21 07:15:37 +0200 received badge ● Popular Question (source) 2020-08-25 16:37:18 +0200 received badge ● Student (source) 2020-08-25 15:50:58 +0200 asked a question Error in integral I've got this error on the second integral. I put the code on wxMaxima and returned sucessfull. On wxMaxima, raise a question "z is positive, negative or zero?", also on sage, but on sage I can't answer that. How can I correct this? x,y,z = var("x y z") function = x*e^(-y) integral(function,y,0,ln(x)).integral(x,0,2*z) 2020-07-09 16:44:54 +0200 commented question Problem on advanced plotting Thanks man! 2020-07-09 00:47:24 +0200 asked a question Problem on advanced plotting How can I resolvve this: Create a plot for the following problem. Find the area that is inside the circle r=2, but outside the cardioid 2+2cos(θ). My code: var('a') polar_plot([2,2+2*cos(a)],(a,0,2*pi)) When I add the parameter fill=RealNumber, the area is filled, but I can't control what the area; what means this parameter?